Fair Value Measurements (Financial Instruments' Carrying Amounts and Fair Values) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	$ 18,988
Long-term debt - VIEs	0		890
Subsidiary preferred stock	257		257
Valuation of certain fair value hedges	93		105
Deferred issuance expenses	2		2
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	16,841	[1]	16,264	[1]
Long-term debt - VIEs	860	[2]	890	[2]
Junior subordinated notes	1,373		1,719
Subsidiary preferred stock	257	[3]	257	[3]
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	19,898	[1],[4]	18,936	[1],[4]
Long-term debt - VIEs	864	[2],[4]	892	[2],[4]
Junior subordinated notes	1,430	[4]	1,786	[4]
Subsidiary preferred stock	255	[3],[4]	256	[3],[4]
Virginia Electric and Power Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	6,676
Subsidiary preferred stock	257		257
Virginia Electric and Power Company | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	6,669	[1]	6,862	[1]
Subsidiary preferred stock	257	[3]	257	[3]
Virginia Electric and Power Company | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including securities due within one year	8,270	[1],[4]	8,281	[1],[4]
Subsidiary preferred stock	$ 255	[3],[4]	$ 256	[3],[4]

[1] Includes amounts which represent the unamortized discount and premium. At December 31, 2012, and 2011, includes the valuation of certain fair value hedges associated with Dominion's fixed rate debt, of approximately $93 million and $105 million, respectively.

[2] Includes amounts which represent the unamortized premium.

[3] Includes deferred issuance expenses of $2 million at December 31, 2012 and 2011.

[4] Fair value is estimated using market prices, where available, and interest rates currently available for issuance of debt with similar terms and remaining maturities. All fair value measurements are classified as Level 2. The carrying amount of debt issues with short-term maturities and variable rates refinanced at current market rates is a reasonable estimate of their fair value.